package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str = "好好学习Java";
        //复制str的内容到builder中---好好学习java
        StringBuffer builder = new StringBuffer(str);
        //append()追加内容--在末尾追
        builder.append(",为了找个好工作");
        System.out.println(builder);
        //replace()替换部分内容(含头不含尾)
        builder.replace(9,16,"为了改变世界");
        System.out.println(builder);
        //delete()删除部分内容(含头不含尾)
        builder.delete(0,8);
        System.out.println(builder);
        //insert()插入内容()
        builder.insert(0,"活着");
        System.out.println(builder);




       /* //StringBuffer的创建方式
        StringBuffer builder1 = new StringBuffer();//空字符串
        StringBuffer builder2 = new StringBuffer("abc");//cbc串
        //String和StringBuffer互转
        String str = "abc";
        StringBuffer builder3 = new StringBuffer(str);
        String str2 = builder3.toString();*/
    }
}
